update gpui

web/Cargo.toml

@@ -32,7 +32,7 @@ console_log = "1.0"
 wasm-bindgen = "0.2"
 wasm-bindgen-futures = "0.4"
 js-sys = "0.3"
-web-sys = { version = "0.3", features = ["Window", "Performance"] }
+web-sys = { version = "0.3", features = ["Window", "Performance", "Location"] }
 universal-time = { git = "https://github.com/shadowylab/universal-time" }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]

web/rust-toolchain.toml

@@ -1,4 +1,4 @@
 [toolchain]
 channel = "nightly"
-components = ["rustfmt", "clippy"]
+components = ["rustfmt", "clippy", "rust-src"]
 targets = ["wasm32-unknown-unknown"]

web/script/build-wasm.sh

@@ -36,10 +36,13 @@ if [[ "$(uname)" == "Darwin" ]]; then
 fi
 
 # Step 1: Build WASM
+#
+# Target features and link args (atomics, shared memory, TLS exports) come
+# from `web/.cargo/config.toml`, which also enables `-Z build-std` so std is
+# rebuilt with atomics support.
 echo -e "${GREEN}Step 1: Building WASM...${NC}"
 cd "$PROJECT_ROOT"
 export CARGO_TARGET_DIR="$PROJECT_ROOT/target"
-RUSTFLAGS='-C target-feature=+bulk-memory -C link-arg=--max-memory=4294967296' \
 cargo build --target wasm32-unknown-unknown $RELEASE_FLAG
 
 # Determine the build directory

web/src/lib.rs

@@ -31,6 +31,30 @@ impl MonotonicClock for CustomTimeProvider {
 
 define_time_provider!(CustomTimeProvider);
 
+/// Returns the preferred WebGPU/WebGL backend, selected with
+/// `?backend=webgpu` / `?backend=webgl` in the page URL.
+#[cfg(target_family = "wasm")]
+fn requested_backend() -> gpui_platform::WebBackendPreference {
+    let search = web_sys::window()
+        .and_then(|window| window.location().search().ok())
+        .unwrap_or_default();
+    if search
+        .trim_start_matches('?')
+        .split('&')
+        .any(|parameter| parameter == "backend=webgpu")
+    {
+        gpui_platform::WebBackendPreference::WebGpu
+    } else if search
+        .trim_start_matches('?')
+        .split('&')
+        .any(|parameter| parameter == "backend=webgl")
+    {
+        gpui_platform::WebBackendPreference::WebGl
+    } else {
+        gpui_platform::WebBackendPreference::Auto
+    }
+}
+
 thread_local! {
     static APPLICATION: RefCell<Option<ApplicationHandle>> = const { RefCell::new(None) };
 }
@@ -96,7 +120,10 @@ pub async fn run() -> Result<(), JsValue> {
         // immediately instead of waiting for a repaint.
         assets.preload().await;
 
-        gpui_platform::single_threaded_web().with_assets(assets)
+        // Multithreaded web: background work (image decoding, network
+        // fetches, CPU-heavy tasks) runs on real worker threads instead of
+        // the main thread, so the UI stays responsive.
+        gpui_platform::application_with_web_backend(requested_backend()).with_assets(assets)
     };
 
     let launch = move |cx: &mut App| {